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main.go
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main.go
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package main
import (
"fmt"
"time"
"imooc.com/ccmouse/learngo/retriever/mock"
"imooc.com/ccmouse/learngo/retriever/real"
)
type Retriever interface {
Get(url string) string
}
type Poster interface {
Post(url string,
form map[string]string) string
}
const url = "http://www.imooc.com"
func download(r Retriever) string {
return r.Get(url)
}
func post(poster Poster) {
poster.Post(url,
map[string]string{
"name": "ccmouse",
"course": "golang",
})
}
type RetrieverPoster interface {
Retriever
Poster
}
func session(s RetrieverPoster) string {
s.Post(url, map[string]string{
"contents": "another faked imooc.com",
})
return s.Get(url)
}
func main() {
var r Retriever
mockRetriever := mock.Retriever{
Contents: "this is a fake imooc.com"}
r = &mockRetriever
inspect(r)
r = &real.Retriever{
UserAgent: "Mozilla/5.0",
TimeOut: time.Minute,
}
inspect(r)
// Type assertion
if mockRetriever, ok := r.(*mock.Retriever); ok {
fmt.Println(mockRetriever.Contents)
} else {
fmt.Println("r is not a mock retriever")
}
fmt.Println(
"Try a session with mockRetriever")
fmt.Println(session(&mockRetriever))
}
func inspect(r Retriever) {
fmt.Println("Inspecting", r)
fmt.Printf(" > Type:%T Value:%v\n", r, r)
fmt.Print(" > Type switch: ")
switch v := r.(type) {
case *mock.Retriever:
fmt.Println("Contents:", v.Contents)
case *real.Retriever:
fmt.Println("UserAgent:", v.UserAgent)
}
fmt.Println()
}